From: George Roman (georgeroman@gmail.com)
Date: Sat Oct 13 2007 - 07:27:14 ART
Hi group I have this question regarding multicast over frame-relay hub and
spoke network (i am pretty week at multicast but i am trying to improve so
please be patient):
Assume that i have 3 routers: R1, R2, R3 with R2 being the the hub of the
frame relay network and also the RP for my the Multicast group (i am using
PIM sparse-mode, and over the FR cloud broadcasts/multicasts are allowed, R1
&R3 connect with R2 via point-to-point subinterfaces, R2 connects to R1&R3
using the major interface and static FR mapping ). Now i make R3 fast
ethernet to join my group ( using igmp join group....) and by using the
source ip address of the fast ethernet interface of router R1 i am trying to
reach (ping) this group i have just joined on R3.
The problem is that this group seem to be reachable for 3 or 4 icmps and
after that it is unreachable.
I have tried to look in the mroute table of my routers to find out what
happens there and here is what i observed:
On R3 RPF check is made on the correct interface (the serial interface), but
on the ip address of R2; on the routing table on the other hand the path to
the router's R1 fast ethernet ip address is via R1 directly, which i find
normal.
Now the question. Is RPF check made only on the interface or does the IP
address of the reverse path have to match also?
Here is what i have done when trying to resolve my problem:
-I have tried to enable ip pim nbma-mode on router 2 but no success there.
-I have put a static mroute that should enabe RPF check via the ip address
of R2 but also without success.
What can be the issue and how can i solve this problem?
Thanks for your time,
George
This archive was generated by hypermail 2.1.4 : Fri Nov 16 2007 - 13:11:14 ART